How can I get a local fix on DOT NextDNS server?

Advise please as I'm based in Melbourne Australia where we have 4 NextDNS PoP servers 
My NBN FttP Fritz!Box 4060 consistently gets two IPv4 server IPs based in Adelaide when called DoT:

FritzBox4060-XXXXXX.dns.nextdns.io

FritzBox4060-XXXXXX.dns1.nextdns.io

FritzBox4060-XXXXXX.dns2.nextdns.io

Strangely only two addresses, 119.252.93.133 (currently used for standard queries - DoT-encrypted)
116.90.72.153 (DoT-encrypted) both in Adelaide

None of the Melbourne addresses that have much lower pings:
https://nextdns.io/diag/d5dfa640-2097-11f0-831b-99fe412c43bc